Because people were *extremely* isolated and information took ages to spread. People very rarely traveled more than 20 miles in a day. If an event happened in one place, it rarely effected areas outside that area. If someone discovered something, that discovery took ages to spread. If knowledge was lost, it took ages to be rediscovered, and not everyone lost everything. Trade and communication did exist, but it was all extremely slow.
That’s not even counting the uneven distribution of resources, manpower, climate, disease, politics, and sheer luck involved in the many events in history.
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